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  1. CDRIVE

    Replace Relay with TRIAC?

    Steve, how many beers did it take? Chris
  2. CDRIVE

    Replace Relay with TRIAC?

    By your last reply I'm beginning to think that your first post (automobile schematic included) has nothing to do with what your project is. Care to elaborate? Chris
  3. CDRIVE

    Replace Relay with TRIAC?

    There's only one power source. That's the car's battery. The load isn't a component of the circuit itself. It represents whatever your relay was powering in your circuit. If this circuit was replacing your relay then the switch in my circuit would be the switch in your circuit too. All that...
  4. CDRIVE

    Basic PIC18F4520 TX/RX question

    Hop, I stand corrected. You're more anal than me! :p Seriously though, thanks for the history. Psss ... I still have about 4 modems squirreled away somewhere. Just in case they come back into fashion. I've been hopelessly waiting for steam locomotives to come back too. My wife is glad I don't...
  5. CDRIVE

    Basic PIC18F4520 TX/RX question

    Forgive me Hop but I'm having an anal retentive moment. ... That would be "Hayes Commands". "AT" is only one command of the many in the Hayes Command Set. Anally yours, :D Chris
  6. CDRIVE

    Trying to go from 12v ac to 12v dc

    The answer Dave gave you isn't bad either. Chris
  7. CDRIVE

    Autotransformers

    Post a link to the Autotransformer you're using. BTW, Duke gave you good advice regarding the none isolation characteristics of an Autotransformer. No one here will help you kill yourself. Chris
  8. CDRIVE

    Replace Relay with TRIAC?

    I don't think it would be fair to your interest in electronics to let you leave this topic without giving you something related to solid state switching. This is the basic circuit configuration used for High Side solid state switching. When S1 is open Q1 is off. This in turn holds Q2 (P Chan...
  9. CDRIVE

    Power 3.3 and on off Power Switch Setup.

    In the world of woodworking, especially woodturning there's what we call the "Magic Proportions". It's used to define an object that's optimally pleasing to the eye. There's actually a formula for it that is said to be defined by one of the Greek mathematicians. Not sure but I think it was...
  10. CDRIVE

    Replace Relay with TRIAC?

    Yes, Dynamotors were big, heavy and (P-in/P-out) inefficient. They were also durable and very tough to kill! They could survive severe overloads and keep on purring. This photo is what I believe to be (haven't seen one since 1967) the transistorized Multivibrator replacement. The Dynamotor and...
  11. CDRIVE

    Replace Relay with TRIAC?

    Bob, You got me thinking that there should be a military acronym in there somewhere. The military loves them you know. Problem is I can't get past "Spurious" for "S". Chris
  12. CDRIVE

    Replace Relay with TRIAC?

    Actually if we want to get really picky regarding proper (technical!) terminology I can't help but remembering my first job after mustering out of the Army. I worked under (Bob) a crusty old Signal Corps tech. The company had a contract refurbishing ARC34 aircraft Tranceivers. These things were...
  13. CDRIVE

    Consultation

    You have other things going on in there besides your FET and 555 issues. Your power supply is ...uh..?? Have you consulted the 78L12 Datasheet for its maximum input voltage? R2 will not protect it from exceeding that rating. Chris
  14. CDRIVE

    Replace Relay with TRIAC?

    Besides, the important points that Ed gave you there must be a means of turning a Triac or SCR off. They don't turn off when gate current (your Gate switch) is cut off. Chris
  15. CDRIVE

    I need help on how to use LEDs on this project

    Since you haven't responded to any of the replies I'm going to assume that you might require a visual aid. Check out the attached schematic and see if it helps you. I chose 220Ω for R2 because it's common value that you may have in abundance. In reality you can use any value from 160Ω to 10KΩ...
  16. CDRIVE

    I need help on how to use LEDs on this project

    If you use a common 20mA Red LED you should be able to connect one end of a 220Ω resistor to +5V. Then connect the other end of the resistor to the Anode of the LED. Then connect the LED's Cathode to the Collector of the Transistor. Chris
  17. CDRIVE

    What is ohms law (was Ic=C x dv/dt)

    The last few months have been a living hell for me, bouncing from one doctor's office and diagnostic center to another. My symptoms are many and thus far the experts are clueless as to what's ailing me. One of my symptoms is not spitting headaches but I've got a whopper of one right now...
  18. CDRIVE

    Wiring of a radio's power supply

    Perhaps your thinking needs a reboot? :) Chris
  19. CDRIVE

    Box that opens and closes at set time

    Just curious because my wife is a wildlife photographer. Why are you feeding the Owls? Chris
  20. CDRIVE

    LM13700 sim in TINA-TI help!

    Whenever simulating oscillators in Tina always select "Use Initial Conditions" or "Zero Initial Values". BTW ... Welcome To EP! Chris
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